Fluid-pressure pump



l June -17 1924. 1,497,912

N. B. JOHNSON FLUID PRESSURE PUMP Filed Aug. 19, 1921 s sneersheet 1 o Il] l Q l I I||| im IIll f\ lmm N. B. JOHNSON FLUID PRESSURE PUMP June 17 1924e Filed Aug. 19 1921 3 Sheets-Sheet 2 .WO n.0 W m @n o xUNmO mu Il lll n J 5 w, III /w /H w l f I M22, Huw M o l .T H WW, a uw N 1 dm. o m\ o .W o Mh, mi :l o linnn m .lm \W QW m OIAN :d .n r -lvl'Ho o NM.

` June 17 1924, 1,497,912

' AN. Es. JOHNSON FLUID PRESSURE PUMP Filed Aug. 19. i921 3 sheets-sheet 5 l Jaz/enfer Patented June l?, 1924.

uur e'sifa'rrs' NELSON B. JHNSON, OF WINTHRG'P, tvASSACl-U'SET-TS. i

FLUID-PRESSURE PME?.

Application filed August 19, i921. Serialblo. 493,647.

Y to eliminate the necessity mountingthe i saril' air tight receiver for the liquid in such a Way as :to rock or otherwise move in performing that operation, to provide an e2;- ceedingly simple and ,durable positive acting motor operated byluid under pressure tor controlling it and having connections for performing the necessary operations 'of opening and closing rthe supply valves all capable oi being located outside of the rcceiver to facilitate repair, and to provide an improved displacement iijoat, for controlling the operation et the motor, which 'has no buoyancy in Water.

'In connection With the .first ot these .objects, this invention comprises the use oit a stationary air tight receiver `for the Water to bepumped, thus eliminating the cumbersome rocking movement as Well Vas the trunnions or glands Wl'iichotherwise are necesp part ofthe same and thus materially` simp4 ifying the old device and permitting it to uioikindenitely Without danger ot itsy being stopped onA account of trouble 'with packings 'or trunnions. Further objects, advantages, and features ot the invention will be described below.

Reference is to be had to the accompany#Y Fig. lis an enlarged central sectionaly view of the valve construction, and

iigs. 5 and G are sectional views lon the 'lint-s 3 5 and 6 5 respectively of Fig. 4f. Although this invention is capable of eral use. it is also adapted 'for returning the water 4of condensation back to the boiler or other source from heating systems, drying systems and various yother devices, condens ing steam for diierent purposes. It has been the practice heretofore to provide pressure pumps of various makes for similar purposes.` These devices .of large type that will handle large quantity of Water ,usually depend for their operation in a tilting movenient of Athe Water receiver for lopening andy closing the inlet `and ,the outlet valves. The receiver when. empty `stays in kone position and when illekd up to a predetermined level the added Weight rocks it over.` In order to'provide tor this tilting movement the receiver has to be mounted on a'pair Aof trunnions .or glands through one of which the vvater is f discharged. The other admits steam `or compressed air for exerting pres-` sure on the surface of the Water to force it out. These glands require packing to pre-` vent leaking, er Iin some `cases they are con.- structedvvith a ball and socket j oint. In the latter case they have to be kept oiled to prevent sticking and in the former case the packing gives much trouble as it is Iditticuflt to pack 4the trunnions or glands so accurately that there will be no leakage and still leave them loose enough not to retard the tilting, action. At the best, allv trunnions are troublesome and after some use Willbe found to be either leaky or in a condition to stick and therefore prevent the entire operation 'of the sys-tem. Furthermore, these receivers are made ,of rather large vsize in some plants and have to be built of heavy steel` plates in order to stand the high pressure.` They'are arranged tofoperate after lcollectingV from 2O to O gallons of waiter and the combined Weight `of the receiver and Wat-er on the trunnions is so great that this type of pump is subject to common complaint on account of the sticking of the pivots and the failure of functioning.

The operation ot such arpressure'pum requires closing of the valve through -Whic the exhaust steam is admitted and the opening of another valve to admit uirh sure, that valve has to be closed and the Water valve'opened also,` by the reverse tilting of kthe receiver. So far as I am aware,

los

the above indicated type is the only one that Vhas proved capable of handling a large amount of water and working under high pressure. The small float action devices are useful only for low pressures and small quantities of water. This invention is designed in such a manner that comparatively large quantities of Water can be dis charged and high steam or air pressures used and at the same time avoid the disadvantages of the tilting receiver.

Referring to Fig. 1, I have shown a strong stationary steel receiver 10 mounted on heavy fixed supports 11 and capable of sus taining high pressure and carrying a large body of water. Tn the form shown, I have indicated it as provided with an inlet 12 Whch is supplied with water from a pipe 13. The inlet 12 is carried above the water level. The object of this is to prevent steam, that finds its way to the pump, agitating the water. I have found in practice7 that, if the inlet enters just through the bottom of the pump, steam would agitate the water, affecting the displacement weight, which in turn acted on the motor control valve, and allowed steam to act on the pisv waterheater, or the like, to supply water to the receptacle 10. vThe admission of the Water is controlled by a check valve la.

At the bottom of the receiver is a water pipe 7 which is Aprovided with an outlet 8.

Thisis provided with a check valve 9 toV permit ,Water to be discharged as desired.` The outlet will naturally be connected with any desired device to which water is to be supplied. y

Y 'A pipe 15 leading into the receiverl() is supplied with high pressure steam, compressed air, or otheriiuid through a passage 17in a casing 18. This is controlled by a steam admission valve 20 connected with a live steam pipe connectionel. This valve has a stem 2l operatedfby a lever 22 pivoted on a link support 23. The passage 1,7 is also connected with a relief Vvalve 19 similarly operatedV by a lever 26. These two levers are provided with weights 24e and 25 for holding the Vvalves closed when they are free to act. The relief valve v19 is ield open by a weighted ,operating lever 27 which has links 28 and 29 for operating the levers 22 and'26. The lever 27 also has a link 30 for operating a weighted lever 30 which controls a water spray valve 31- for a purpose to be described.

A steam baffle plate 16 is shown where the steam enters the top of the pump receiver, for the purpose of displacingthe internal piping.

water. The special object of this baille is to direct the flow of steam so that the surface of the water is not agitated. It also prevents water hammer that is so often caused in pumps of this makeup by allowing high pressure steam to be entrapped in the water contents. The said baille also allows .for the expansion of steam as soon as it leaves the pipe connection, by having many times the area of the steam supply pipe, and by having its two ends open. A steam blanket is noiselessly formed above the surface of the water and pressure is quickly and noiselessly generated, equal to that carried in the boiler, when required, causing the water contents of the receiver to quickly discharge into the boiler.

Located in the receiver 10 isa float ball y 32, preferably formed of cast-aluminum and hollow. This float ball is made so as to stand high external pressure, more than is ever used in steam boilers employedv for manufacturing purposes. Tt is also made so as to overcome'the dilliculty encountered by the leakage of the water through ,the aluminum under very high pressure. For this purpose l simply make the float of such shape that it has at the bottom a straight line communicating with the inlet and outlet in a straight line. rThis is connected with a pipe 35 on a line tangent tor or in line with the bottom of the float. Thus when the float rises to the dotted line position in Fig. 1 all the Water will drain out. This happens once during each cycle of operations. Therefore there is never any chance of water logging and no complicated The float is rigidly connected with a lever 35 pivoted on a horizontal central'shaft 36 and having on the other arm a counter weight 37. yIt lis counterweighted to reduce its weight in water substantially to nothing. The shaft 36 and lever 37 are provided with a tube 38, preferably of copper, and terminating in a pet cock 39 on the outside'of the receiver to constitute a vent if ever the float should become filled with water.

Should the float 32V become completely tilledV with water, of course it would cause the float to remain resting on the bottom of tne receiver V10 as shown in Fig. 1. Now to remove the water from the float 32 it is only necessary 'to raise the lever 27 and hold it up.r opening the steam admission valve 29..A This allows steam to flow into the pump receiver 10, discharging its water contents. After water has been discharged rom the pump receiver 10, the petcock 39k u naamw should bek closed, Thus xa positive means of keeping the float 32 in functioning condin tion is' provided without ever having to take the pump apart and make repairs due to in the tube v33. `When pressure is exhausted from the receiver in the operation of discharging the l.water therefrom, any water which may havel leaked into the copper iloat will be forced to rise in the tube 33 by the expansion' of the air trap in the float aheve its level. This expansion is permitted at this tinieli7 the reduction in the pressure outside the float. Therefore when there is any water in the ybottom -of the air fioat, the pressure alboveitivill be equal to the pressure oi" the air orreceiver' and when that pressure is` reducedy the excess water will be discharged through the tube. Thus there is never any chance of water-logging and no internal complicated piping.

On this shaft 36 in either form `is fixed a frame 4or lever 40 comprising two rigid arms shown as arranged at about 900 from .each other.l Eaehis proyided with an adjustable braeket'4l havin@ a roll 42 thereon.' rllhese rolls extend inw'arzdly from the arms or toward each other; Y

Pivotally rneunted o n a shaft or stud 43 isa. weighted lever having roll 45 on its! lower short arm. This roll works between the two ends or" a yoke 46 and is adapted t0 more .it back and ferte a Short distance aswill beseenjby comparison of the extreme positionsV shown in Figs. l and 4. rThe yoke 46 is iixed to a valve stem 47 provided Iwith a control or pilot valve 48. This valve controls they admission of steam through la port, having a valve seat 49 and is closed when no water is being diseharged.

nis port, and 1therefore the valve casing, is suppliedwith live steam through a pipey 54 from a source of supply. The valve cas`- ing` 50 has a relief port 5lk controlled by the other end of the valve The weighted lever 44 tends to hold the valve 48 yieldingly either in closed yor open position .as placed by the iioat. The stud 43 is mounted on the plate 30h. n

The casing 50 has an outlet 52 that cornmunicates through a pipe `53 freely with the top of a piston pressure chamber 55. This chamber consists of a pipe easing closed at the top and bottoml by eaps ,and clentanins'weter ,nearly er t0 its @QP- It is shown as oarried by one of the supports l1. It has in it a coppertube r`58 whiexlie'xL tends through its wall'and into the motor cylinder 58. The piston pressure forms a pocket on ywhich the steam pressure is allowed to act ,to force ywaterinto this cylinder. In the motor cylinder isa pistony 59. The pisten 59 is `'arranged with suitable packing (50 on its top side Vandy a seat 6l is `formed in the npperend ofthe piston cylinder' so that when the piston its uppermost position the packing on "the piston is held tightly against said seat, thereby making the piston waterV tight,- while the pump is discharging. This is very advantageous when these pumps are ,used for boiler Water feeders, as `the piston has to remain in its upper position for long pe riods. and with the packing on the'si'desfof the piston only, leakage isvery apt to voecur, andrenewing of packing would be required much oftener. I usetlie side packing also. Tt is to be noted thatthi's arrange' inent allows the mot-or piston to be operated byv water instead of steam. .This vslows down theaetion very much so that high pressure can be used ywithout acting ytoo suddenly. The piston has a rod 62 [which ypivk'itally supports the lever 27 and operates' it i The operation of thedevic'e vis as follows :-Let it be assumed that the water is substantially exhausted'ironi the receiver so that the float 32 has reached substantially its lowest position as shownin zFigll. This results in turning the frame't() 'over to tl'ie right from the position shown in Fiigffgl to that shown in Fig. l. This throws over the lever 44 and closes the valve l48,` open'- ing the relief portat A51. This cutsithe' live steam from the port 52"and pipe The rst result of tliis'is to remove the pressure from the top of the waterin the piston pressure chamber 55 and allew'the level of the water therein torise. In other words, the counterweight 6.5 on the" leverV` 27 can now foi-ce the piston rod. 62 down andthe piston 59 with it, the water under the piston 50 vflowing through the-tube back into the piston pressure chamber.r` The lever 27 thus moves to the position shoivii`r in Fig. l. This closes the 'valve 2l sodas to shut off the live steam pressure from theV valve 48, opens the relief valve 19 to permit the steam to be exhausted, and also opens the waterspray valve rk3l and admits the'water through the Water spray pipe below to condense steam in the receiver and thus Create a partial vacuum therein. The

result of all this is to facilitate the' flow that which has been taken out. u

As the water rises in the receiver the iioat 32 rises with it and inallyit reaches the point shown in Fig. 2 at which time it turns the frame 40 over to the left' andv takes of water in through the inlet 12 to replace the lever 44 With it to the position shown in Figs. 2 and 1l, thus opening' the valve Sand closing the relief 5l. This admits live steam through the port 52 and pipe into the motor casing 55 -which exerts pressure on the top of the ivater in the piston pressure chamber below. The eflect of this is to drive Water up the tube 56 into the motor vcylindei' 58 and lift the piston 59 so as to raise the lever 27 with its counterweight. The effect of this is to open the steam valve 2l, allowing. the live steam to flow into the receiver through the inlet la against the baffle plate lland again exert steam pressure on the top of the water therein. The relief valve i9 is also closed and the Water spray valve 3l by the lever 27 as indicatedin Fig. 2.

It will be seen therefore, that I have 1 provided a stationary receiver which can be made as large and `heavy as may be de sired Without 'interfering with the voperation of its connections, which Will he capable of ,performing allA duties that can be performed by any piston pump and which can handle Water heated to high temperatures Without trouble, and it also avoids the trouble ordinarily encountered when feeding Water into boilers under high pressure by means of piston pumps due to leakage past the packing glands or piston. The Wear is obviously reduced, in fact almost entirely eliminated, and the necessity for Vattention and repairs also.rl`lie discharge of the Water through the outlet- 8 is -capable of taking place at all times Whether the steam valve is open or closed. rlhe pump is especially valuable for supplying feed Yiva vter to high pressure boilers for these reasons. I Inasmuchas an absolute predetermined amount of Water` has to be discharged by the pump for each cycle of operation, this type of control keeps the steam pressure on the piston Water pressure chamber until the predetermined level of' the displacement Weight has been reached in the pump receiver. The valve, at this point, is suddenly closed against steam pressure and the relief port opened from the motor piston. lVith such action slight lealrages do not affeet the action-of the pump.

Steam pressure cannot be communicated ,from the pump receiver to the control valve that would affect the same. The valve cannot be prevented from operating by pa-cle ing a valve stem too tight. The quick action of the valve stem also prevents Wire The small area of the highA drawn seats. pressure steam port allows of .very easy closing against the very highest steam pressure, and the friction of the packing around the valve stem keeps the valve closed. This ackinO` land is made ence ationallv deep so as to hold plenty of packing for this 'plllpOSe- M Although I have illustrated and described only one form of the invention, I am aware of the fact that modifications'can be made therein by any person skilled in the-art without departing from the scope of the invention as expressed in the claims.y Therefore, I do not Wish to be limited to all the details of construction herein shown and described but what I do claim is l. In a fluid pressure pump, the combination with a receiver for the Water to be pumped, having an inlet for admitting fluid under pressure on the surface of the Water therein, and a vent, of an inlet valve, a vent valve for alternately venting and closing the receiver, means for operating both valves, means connected with the valve'op# erating means for holding the vent valve open when Water is flowing into the receiver, and for closing the vent valveivhen Water is to be forced `out of the receiver,A means whereby thefvalveoperating means Will actv to positively close the vent valve 'before opening the pressure inlet valve, and means operated by the fluid under pressure in the receiver for forcing fluid into said valve operating means to open the inlet valve,

whereby the pump can be operated at a moderate speed by the use of high pressure fluid. 'Y Y 2. In a fluid pressure pump, the combination With a closed receiver for the Water to he pumped having Van inlet for Water, and an inlet for fluid under pressure for forcing the Water out vof the receiver, a valve for controlling the admission of the pressure fluid,V hydraulicmeansv for opening said valve, a cylinder for containing Water, means for admitting high pressure fluid into said cylinder above the Water, and means for conducting Water from thecylinder into said valve opening means when the Water in `said cylinder is under pressure for operating said means slowly and opening the valve. A

3. In a fluid pressurepump, the combination with a closed. receiver for the Water to be pumped having an inlet for admitting fluid under pressure on the surface of the Water, a valve for` controlling the admission of pressure fluid, a motor, a lever operated Vby the motor Vconnecting With said valve for opening it, a chamber containing Water, means for admitting high pressure fluid into said chamber above the Water, and a pipe in said chamber for conducting Water from thechamher into the motor When the Water in said chamber is put under pressure for operating the lever.

e. vIn a fluid pressure pump, the combination with a closed receiver for the Water to be pumped having an inlet for admittingV fluid under pressure over the Water in theV receiver, a valve for controlling the admis sion of fluid through said inlet, a cylinder and piston having connections for opening said valve, a pressure chamber for containing water, means for admitting high pres-.

sure fluid into the chamber over the water, means for conducting water freni the chaiiif ber into the motor when the water in said chamber is under pressure to `operate the motor, a valve for controlling the admission 0f pressure fluid into the chamber, a float in the receiver, and means connected with said float for opening said valve when the float rises above a predetermined height.

5. In a fluid pressure pump, the combination with a closed receiver for the water to be pumped having an inlet for fluid under pressure for forcing the water out, a valve for controlling the inlet, al motor for opening said valve, means operated by fluid under pressure for forcing water into said motor to operate it, whereby the motor can beroperated at a moderate speed with high pressure fluid, a valve for controlling the admissionof pressure fluid into said wate 1 forcing means, a. float in the receiver, and means connected with said float for openingrsaid valve when the float rises above a predetermined height. p

6. In a uid pressure pump, the combination with a pressure admission valve yand means for operating the valve, of a cylinder for containing water, means for admitting high pressure fiuid into said cylinder above the water, and means for conducting water from the cylinder into said valve opening means when the water in said cylinder is under pressure for` operating said means slowly and opening the valve, said pressureadmitting means comprising a valve, a yole Connected with thevalve, a lost; motion connection for reciprocating the yoke, a pivoted float, and a lever connected with the float for opera-ting the yoke when the float rises or falls beyond a certain height.

7. In a fluid pressure' pump,`the combi-` nation with a pressure admission valve and means for operating the valve, of a cylinder for containing water, means for admitting high pressure fluid into said cylinder above thevwater, and means for conducting lwater,

from the cylinder into said valve opening means when the water in said cylinder is under pressure for operating said means slowly and opening the valve, said pressureadmitting means comprising a valve, a yoke connected witht-he valve, a pivoted float, a lever connected with the float for operating theyoke' havingtwo arms at an angle to each other arranged to swing with the float, a weighted lever having one arm extending between said two arms and arranged to be operated by them and having an `arm eX- tending into the yoke to constitute a lost motion means for operating it.

-8. In a fluid pressure pump, the combil 4nation Switha fini/red air tight receiver having -an diitl'etandl inlet connectioniii the bottom' thereof, check valves therein for preventing water flowing lin the wrong direction through them, a float in said receiver, a valve rod, a lost motion connection between thekfloat and valve rod for'operatin'g the latter upon the raising of the float, means kcontrolled by said valve rod for admitting fluid under pressure t'o said receiver and driving water out of it, and means confloat by gravity once during each cycle of operations. y i Y 10. A steam pressure pump comprising a stationary receiver having an outlet below the water thereof and an inlet for fluid under pressure, a` valve for controlling said inlet, and means operated by the rise of the water level in said receiver, when it rises above a predetermined level, for positively opening said valve to admit' Huid pressure above the water in the receiver, said re ceiver having a normally open inlet for water opening therein above the high water ylevel to prevent agitation of the contents by the admission of water.

l1. ln a steam pressure pump, the combination of a stationary receiver having a water outlet, an ,inlet for fluid under pres` sure, a valve for controlling said inlet, a,

fluid motor comprising a piston, a pilot valve for controlling the admission of fluid pressure to said motor to move the piston, a float in the receiver, means operated by said float for opening said pilot valve when the float rises and admitting pressure to said motor, and means operated by the piston for positively opening theiirst named valve to yadmit fluid pressure above ,the water in the receiver.

l2. In a fluid pressure pump, the combination with a stationary air tight receiver for water, afloat therein, a piston, andl a cylinder having an admission and exhaust port, of means connected with the piston'for admitting fluid under pressure into said receiver and forcing the water out ofit, al valve for controlling the admission of fiiiid vthrough said port, means for yieldingly holding the pilot valve in extreme closed or open position, a movable rod adapted to vmove said pilot valveto open or closed posi-- means connected with the piston for admitting pressure fluid into 'said receiver and forcing the Water out of it, means for conducting fluidinto thecylinder behind the piston, a connection having an admission port for controlling the admission of fluid to said cylinder, a valve, means fory yielding'ly vholding the pilot valve` in position to close said port, a movable rod adapted to move said valve into position to admit pressure tothe cylinder, and a connection With said float for operating said rod, said float consisting ofra hollow body, said float having means carried thereby for conducting liquid out of the float by gravity .When the float rises.

Y 14. In a fluid pressure pump, the combination With a stationary air tight receiver' for Water, a float therein, a pressure admitting valve, a piston and a cylinder, saidr cylinder having an admission port for conducting fluid into the cylinder behind the piston, of a pilot valve, meansfor yieldingly holding the pilot valve in'either closed or open position, a rod adapted to move said pilot valve, a connection With said float for operating said rod, a Weight supported by said piston and movablel therewith, and a lever for operating the firstnamed valve having means for normally holding the valve closed, said lever being in position to be operated by said Weight When it rises, to open the first named valve.

15. ln a fluid pressure pump, thercoinbination With a receiver for Water, a float therein, an admission valve, a piston, and a cylinder, said cylinder having an admission port for conducting fluid into the cylinder behind the piston,-of a pilot valve, means for holding the pilot valve in position to cut off-pressure from said port, a rod adapted to move said piloI valve int-o position to l admit pressure to the cylinder', a connection with said float for operating said rod, and a lever for operating said'admission valve having means for normally holding the valve closed, said lever being in position to be operated by said piston, when it rises, to open the valve. f

16.V In a. fluid pressure pump, the combination with a stationary air tight receiver for Water, a float therein, a piston and Va cylinder having an admission port, an exhaust port, said cylinder having an end seat for the piston, and packing on the end of the piston to make the piston Water tight when the pump is discharging, of means connected With the piston for admitting fluid under pressure into said receiver above the Water, a pilot valve, `means for movingsaid pilot valve'out of its normal position to admit pressure to the cylinder, and Va connection vvith said float for operating said means.

. l?. A steam pressure pump comprising a stationary` receiver having an outlet below lever havinga Weight for normally holding the lever down, a motor for operating the lever, a lever in the receiver, a float thereon, a counterweight on the lever to he operated by the float, and a valve for controlling said motor arranged to be operated by the last named lever.

18. A steam pressure pump comprising a stationary receiver having an outlet below the Water level thereof andan inlet for fluid under pressure, a valve for controlling said inlet, means for positively opening said valve to admit fluid pressure and force Yivater from the receiver, said means comprising a lever having a Weight for normally holding the lever dovvn, and means for raising said lever and its Weight, a lever pivoted in said receiver and having a float at one end and acounter-vveight at the other, a valve operating lever operated by said float lever, and a valve for admitting pressure to the Weight raising means controlled by the last named lever.

19. A pressure pump comprising a stationary receiver having an inlet for fluid under pressure, a baffle plate under, but spaced from, said inlet to preventl agitation of the surface of the Water in the receiver and prevent Water hammer, a valve for controlling said inlet, a lever pivoted in said receiver and having a float at one end and a counteriveight at the other, a valve operating lever operatively connected With said lever, and a valve for admitting pressure to the valve controlled by the last named lever.

20. A steam pressure pump comprising a stationary receiver having an outlet below the y Water level thereof and an inlet for steam, a valve for controlling said inlet, means, operated by the rise of the Ywater level in said receiver, for positively opening said valve to admit steam pressure and force Water from the receiver, said means coinprising a lever for operatingsaid valve having a Weight for normally holding the lever down and the valve closed, a inotor having means for raising said lever and its Weight, a valve for controlling the admission of Water having a spray nozzle connected With it and located in the receiver to introduce a spray and condense the steam inthe receiver, said Weighted lever having connections for operatingthe Ylast named valve', and means connected With said motor for holding the lever in position to open one-valve andclose the other. Y

21. A steam pressure pump comprising a stationary receiver having an outlet belovv thevvater level thereof and an inlet for fluid under pressure, a valve for controlling said inlet, means for positively opening saidy valve to admit fluid pressure and force water from the receiver, said means comprising a lever having a Weight for normally holding the lever down, means for raising said lever and its weight and opening said valve coniprising a motor connected with the lever, a

spray water admitting valve for the receiver,

and means connecting the lever and water valve to hold the latter closed when the steam valve is open.

22. In a fluid pressure pump, the combination with a stationary closed receiver, of valve controlled means for admitting fluid under pressure to said` receiver, valve controlled means for relieving the receiver of fluid pressure, av float in the receiver, a fluid operated motor having connections for controlling both valves comprisina movable member arranged to hold the rst named valve controlled means open and to allow it to close when the piston rises, and to first positively open the second valve controlled means, and means controlled by the float for operating the motor.

23. A steam pressure pump comprising a stationary receiver having an outlet below the water level thereor1 and an inlet for fluid under pressure, a Valve for controlling said inlet, means operated by the rise of the water level in said receiver for positively opening said valve to admit fluid pressure and force water from the receiver, said means comprising a lever for operatin said valve having a weight for normally ho ding` the lever down and the valve closed, and means for raisingrsaid lever and its weight.

24. In a fluid pressure pump, the combination with a stationary closed receiver, of means for admitting water to said receiver, a relief valve, valve controlled means for admitting fluid under pressurekto said receiver for forcing the water out, a float in the receiver, and a fluid operated motor controlled by said float having connections for controlling both valves to close the relief valve before the fluid pressure valve is opened.

25. A fluid pressure pump, comprising a closed receiver for the water to be pumped having an inlet for fluid under pressure for forcing the water out, a valve for controlling the inlet, a motor for opening said f valve, means operated by fluid under pres sure 'for forcing water into said motor to operate it7 whereby the motor can beA operated at a. moderate speed with high pressure fluid, and means for controlling the admission oi' pressure fluid into said water forcing means.

26. A piston pressure device for operating a piston in a cylinder comprising a.l water chamber, means for conducting a fluid under pressure into the top of said chamber to exert pressure on the water therein, and a. tube connected with the chamber below the water level thereof connected to the cylinder for conducting water into the cylinder back of its piston.

27. A fluid pressure pump, comprising a closed receiver for the water and mea-ns for 'controlling the admission of fluid pressure into the receiver to force the water out, said controlling means comprising a hollow cast aluminum float in the receiver, a tubular arm pivoted in the receiver to the end of which the float is connected and with the interior of which it communicates, said arm being arranged tangent to or in line with the bottom of said float, whereby when the float is elevated the water will drain by gravity from the float, and means 'for discharging water from the interior of said arm outside the receiver.

28. A fluid pressure pump, comprising a closed receiver and means for controlling the admission of fluid pressure kinto the receiver to force the water out, comprising a hollow float in the receiver, a tubular arm pivoted in the receiverto the end of which the float is connected and with the interior of which it communicates, said arm being arranged in line with the bottom of said float, and means for discharging water'from the interior of said arm outside the receiver,

In testimony whereof I have hereunto affixed my signature.

NELSON B. JOHNSON. 

